Shedding motion for a weaving machine

ABSTRACT

The present invention refers to a shedding motion in a weaving machine with filling insertion from a filling yarn supply package outside of the warp shed, whereby the end of each pick is pulled out over at least some of the width of the shed and beyond the cloth selvage by a withdrawing carrier.

United States Patent Bruhwiler et al.

[151 3,678,967 [451 July 25,1972

SHEDDING MOTION FOR A WEAVING MACHINE Othmar Bruhwiler; Anton Egloti, both of Brugg, Switzerland inventors:

Georg Fischer AG Brugg, Brugg, Switzerland Sept. 11, 1970 Assignee:

Filed:

App]. No.:

Foreign Application Priority Data Dec. 4, 1969 Switzerland ..l8047/69 U.S. Cl. .....l39/35, 139/122 R Int. Cl ..D03c 13/00 Field of Search ..l39/35, 116,122 R, 122 N,

References Cited UNITED STATES PATENTS 2,772,697 12/1956 Dewas ..l39/l22 R 3,443,602 5/1969 Schaffer.... 3,232,320 2/1966 Eilhauer "139/127 R Primary ExaminerHenry S. Jaudon Attorney-Rodney C. Southworth 57] ABSTRACT The present invention refers to a shedding motion in a weaving machine with filling insertion from a filling yarn supply package outside of the warp shed, whereby the end of each pick is pulled out over at least some of the width of the shed and beyond the cloth selvage by a withdrawing carrier.

3 Claims, 8 Drawing Figures Patentad July 25, 1972 I 3,678,967

3 Sheets-Sheet 1 Fig. 1

I NVEN TORS OTHMAR BRUHW/LER A/vrglv E)GLOFF ATTORNEY Patented July 25,1972 3,678,967

3 Sheets-Sheet 5 I INVENTORS OTHMAQ BRUHW/LER ATTORNEY SI-IEDDING MOTION FOR A WEAVING MACHINE BACKGROUND OF THE INVENTION Shuttleless weaving machines are known in which the insertion of the filling into the warp shed is effected by an inserting carrier and a withdrawing carrier being inserted into the shed from beyond the two cloth selvages and actuated by a mutual drive, whereby the inserting carrier transports the filling yarn from a supply package to the approximate middle point of the cloth, where it is transferred to the withdrawing carrier which, on the reverse or outward movement of the carriers, pulls the filling out over the second half of the cloth. The filling yarn is inserted either in the form of a loop running over guiding surfaces of the carriers, or otherwise, clamping carriers are used that pull the filling across the shed with its tip ahead.

In both cases, a small piece of filling projecting beyond the clamping point or the guiding point of the withdrawing carrier has to be pulled out over the cloth selvage when the withdrawing carrier leaves the shed. As at this moment the warp shed can already be closed or even crossed with certain insertion systems or in certain cases of application, it is possible that V said piece or end of filling will meet with high resistance between the warp ends, particularly when using highly textured filling with slubs or loops. This situation may lead to stretched picks, filling breakage and possibly, wiping off some of the slubs, etc. to remain in the cloth.

It is a task of the present invention to create a motion or device that allows one to overcome the aforementioned problems. It is of particular importance that the pick which has just been inserted is held in the shed by an immediate contact with the warp ends of the top and bottom shed, but that the said piece of filling projecting beyond the withdrawing carrier is not obstructed or unduely restrained on its way out of the shed.

SUMMARY OF THE INVENTION The present invention is characterized in that a pointed bar or rod-shaped member or needle is movably guided between the withdrawing carrier and the fell of the cloth for lengthwise movement approximately parallel to the path of that carrier and is driven in and out of the shed synchronously with the filling insertion, whereby the point of this member on its way out of the shed runs after the tip of the withdrawing carrier until past the cloth selvage.

The drawings show by way of example one configuration, wherein:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing part of a shuttleless weaving machine with a withdrawing carrier and a shed forming needle before leaving the shed,

FIGS. 2a, 2b and 2c are front views of the shedding motion with shed forming needle, showing different points in the cycle of the movement of the needle point in the shed,

FIGS. 3a, 3b and 3c are schematic views of the warp shed and other parts at different positions of the withdrawing carrier taken at line I" in FIG. I, and

FIG. 4 is a similar view to FIG. 3, however, taken on line IV of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT.

Shown in FIG. 1 is a needle guide 2 mounted on the left hand loom side 1 by means of screws 3, said needle guide being parallel ,to a guide 4 of the insertion member 5 with the carrier 6. Furthermore, there are a lay 7 with a reed 8, a reed clamping ledge 9 and a lay sword 10. The warp ends 11 together with the filling threads 12 form the cloth 13. The filling I4 is further inserted after transfer by the withdrawing carrier 6 during which the end 16 of the filling 14 is projecting beyond the clamping point 15 of the taking carrier 6.

According to the invention, a shed forming needle 19, adjustable in the driving head 18 is guided, for example, by Oilite bushings 17 in the needle guide 2 for movement to and fro in the direction of the arrow 20. The longitudinal axis of the needle is approximately at the height of the carrier 6 and between the carrier 6 and the fell of the cloth 34. The timing of the needle is coordinated with the filling insertion cycle so that it enters the open shed and thereafter withdraws completely from the shed. The reverse movement of the needle 19 is timed in relation to the withdrawing carrier 6 so that the needle point 21 runs behind the tip of the carrier at a certain distance 22 and passes or exits from the cloth selvage correspondingly later. FIG. 1 shows the situation just before commencement of the needle withdrawal. The depth of penetration of the needle 19 is approximately equivalent to the length of the filling yarn piece 16 plus the distance 22. The distance 22 can be approximately one-third to one-half of the length of the filling piece 16.

FIG. 2a shows in front view the shed forming motion during the withdrawal of the needle 19. This FIG. 2 also shows the mounting of the needle guide 2 on the loom side 1 and, by way of example, one drive for the needle. A slide 24 of a lever 25 engages in a driving head 18in such a way that a movement initiated by a cam control, not shown, but synchronized with the main drive shaft, transferred via a push rod 26, is transformed into a sliding movement of the shed forming needle 19. It is also possible to guide the shed forming needle in a different manner and, e.g. to let it carry out a swivel movement.

In FIG. 2a, a position of the needle point 21 is shown in the phase of leaving the warp ends 11. The warp ends 11 slide off the needle point 21 whereupon they meet each other.

In the phase as per FIG. 2b, the needle point 21 has returned past the selvage 23 and is about in its outermost position. The warp ends 11 form one sheet, i.e. the shed is closed; the warp ends might even have crossed in this position.

FIG. 26 shows the phase of the needle point 21 entering the open warp shed 27 formed by the warp ends 11.

FIGS. 3a, 3b and 3c are schematic views of the shed in different phases of the weaving cycle. The warp ends 11 in the top shed 30 and in the bottom shed 31 lead through heddles 29 and through the reed 8 to the fell of the cloth 34 and form the shed 27. From the fell of the cloth 34 the cloth runs through the temple 28 which, for the sake of simplicity, is not shown in FIG. 1.

In FIG. 3a the withdrawing carrier 6 is still well within the open shed 27, and the shed forming needle 19 has also penetrated into the shed 27.

FIG. 3b shows a later phase. 'The withdrawing carrier 6 with the filling l4 and the filling piece 16 (end of the filling thread). approaches the cloth selvage 23. The warp ends 11 of the top shed 30 and of the bottom shed 31 have approached much closer. The filling 14 and the filling piece 16 are still lying free in the shed 27.

FIG. 3c shows the phase immediately before the withdrawing carrier 6 leaves the shed 27.

FIG. 4 demonstrates the situation at the same moment as in FIG. 3c, however, at the point of line IV, FIG. 1, that is, within the range of the distance 22 between the tip of the withdrawing carrier and the point 21 of the shed forming needle 19. The warp ends 11 of the top shed 30 and of the bottom shed 31 have already crossed. The filling thread 14 is positioned at the crossing point 32, FIG. 4, and in immediate contact with the warp ends 11 whereby it is fixed. Between the withdrawing carrier 6 and the shed forming needle 19 there remains a space 33, i.e. a sort of small open shed, in which the filling piece 16 can move without obstruction. Since this filling piece 16 leaves the shed 27 after the withdrawing carrier 6, it is essential that the point 21 of the shed forming needle 19 is offset in relation to the withdrawing carrier 6, or that it lags behind the carrier.

The device according to the preceding description makes it possible to pull out also structured or physically patterned yarns with slubs or loops past the cloth selvage, even though the shed has been closed or crossed throughout enough of its extent to hold the pick. There is no danger of a filling snapback.

This disclosure of a preferred embodiment of the invention is to be interpreted as illustrative of one form the invention may take and modifications will readily occur to those skilled in the art. The invention is not to be restricted except by the scope of the appended claims wherein the novel features desired to be protected by Letters Patent are set forth:

' We claim:

1. A shedding motion for a weaving machine of the type in which filling is inserted from a filling yarn package positioned outside of the warp shed, and in which an end of each pick is pulled out over the cloth selvage by a withdrawing carrier, characterized in that, a needle-like member (19) of approximately the size of the withdrawing carrier is guided to enter the shed between the withdrawing carrier (6) and the fell of the cloth (34.) for lengthwise movement approximately parallel to the path of the withdrawing carrier (6), and means for 2. A shedding motion as defined in claim 1, wherein the I point (21) of the needle-like member (19) is offset by an adjustable distance (22) in relation to the withdrawing carrier 3. A shedding motion as defined in claim 1, wherein the diameter of the needle-like member (19) is determined by the required space (33) between needle (19) and withdrawing carrier(6). 

1. A shedding motion for a weaving machine of the type in which filling is inserted from a filling yarn package positioned outside of the warp shed, and in which an end of each pick is pulled out over the cloth selvage by a withdrawing carrier, characterized in that, a needle-like member (19) of approximately the size of the withdrawing carrier is guided to enter the shed between the withdrawing carrier (6) and the fell of the cloth (34) for lengthwise movement approximately parallel to the path of the withdrawing carrier (6), and means for driving the needlelike member in and out of the shed synchronously with the filling insertion, whereby the point (21) of the member (19) enters the open shed (27) and on its way out of the shed runs after the tip of the withdrawing carrier (6) until past the cloth selvage (23) and for a distance at least equal to the length of the free end of filling extending from the withdrawing carrier.
 2. A shedding motion as defined in claim 1, wherein the point (21) of the needle-like member (19) is offset by an adjustable distance (22) in relation to the withdrawing carrier (6).
 3. A shedding motion as defined in claim 1, wherein the diameter of the needle-like member (19) is determined by the required space (33) between needle (19) and withdrawing carrier (6). 